var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
const bodyParser = require('body-parser');
var logger = require('morgan');
const fs = require('fs');
const compression = require('compression');
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
const paperRouter = require('./routes/paper');
const questionRouter = require('./routes/question');
const trainingRouter = require('./routes/training');
const anwserRouter = require('./routes/anwser');
var app = express();
var http = require('http').Server(app);

app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
// 记录访问错误日志
app.use(compression());
const errLogger = fs.createWriteStream(path.join(__dirname, 'err.log'));
app.use(logger('common', {stream: errLogger}));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(express.static(path.join(__dirname, 'public')));
// 解决跨域问题
app.all('*', function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");
res.header("X-Powered-By",' 3.2.1');
res.header("Content-Type", "application/json;charset=utf-8");
next();
});
// 路由
app.use('/', indexRouter);
app.use('/user', usersRouter);
app.use('/paper',paperRouter);
app.use('/question',questionRouter);
app.use('/training',trainingRouter);
app.use('/anwser',anwserRouter);

// 错误处理
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});


module.exports = app;
